| http://www.w3.org/ns/prov#value | - Using a BCA recorder 13, the disk manufacturing apparatus 21 PE-modulates BCA data 16 a, 16 b, 16 c including the identification codes 12 a, 12 b, 12 c, such as IDs that are different for each disk., and forms barcode-shaped BCAs 18 a, 18 b, 18 c on the disks 10 a, 10 b, 10 c by trimming with a YAG-laser.
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